The servarr wiki and the trash guides have a lot of info on what the various pieces do and how to set them up. I didn't strictly follow them but I've browsed them to get ideas on stuff like custom formats and such to get sonarr/radarr to automatically download and upgrade towards the codecs/quality that I prefer.

Personally I run Plex+jellyfin side by side to start, then sonarr/radarr/lidarr to download and organize TV/movies/music, with prowlarr to auto setup torrent sites into sonarr/radarr/lidarr, with a transmission+VPN docker container connected to each of the same 3, and finally an overseerr web ui that my friends can log into to submit requests to be auto downloaded by sonarr/radarr.

It's a lot to set up at once, but I started out with just Plex like 10 years ago and I've slowly added each container as time went on so it's only like a couple weekends a year where I tinker with it or do a migration to a new box as I moved from place to place and had different spaces available for my gear. Start with just a Plex and/or jellyfin server, you can tinker with sonarr/radarr without using it to auto download at the start. It's still super useful for renaming / organizing files, and you can only add certain folders if you don't want it to mess with a collection that you prefer to manually manage. Or create a new junk library folder to let it run amok with until you have it configured to your liking. Add in a torrent+VPN/Usenet downloader container to get it auto downloading when you're ready, and when you get tired of accepting requests personally from friends, an overseerr (for Plex) or jellyseerr (for jellyfin) container they can log into with using their existing Plex/jellyfin login to have their requests automatically forwarded to the appropriate *arr app and you'll have a fully automated low or no touch piracy setup. One of these days I'll also get bazarr up and running to make it easier to grab subtitles too since every once in a while I download something obscure and the only torrents for it dont have subs so I manually grab them from opensubtitles or something. It feels pretty magical though when you've requested a series and throughout the week, you see new episodes just pop up on the recently aired/added row in Plex/jellyfin within an hour or two of the episodes airing.